JP2002127102A - Cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter having a long life wherein cutting of a hard material of much cutting powder such as a ceramic siding board can be efficiently carried out. SOLUTION: In a cutter wherein a plurality of tips are provided on a peripheral edge of a rotary substrate, the tip is composed of a sintered compact containing a diamond particle, a hard phase having WC principally and a bound phase metal comprising a ferrous metal. All tips may be made as above, or a part of the tips is made as above and the remaining may be made of a sintered compact containing no diamond particle. A rate wherein the diamond particle is contained, is preferably 10-50% in vol.%. The sintered compact has the higher rate of a ferrous metal in the area nearer to a bonded part of the rotating substrate, and has the higher rate of WC in the area more distant from the bonded part. Thereby, the service life of the tip is prolonged, and the bonding strength of the compact with the rotating substrate is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting cutter mainly used for cutting wood, building materials such as exterior siding boards, FRP (fiber reinforced plastics), marble, carbon and the like.

[0002]

2. Description of the Related Art Conventionally, a cutter using a cemented carbide tip has been generally used for cutting this kind of material.

[0003]

A cutter using a cemented carbide tip is excellent in cutting performance of a relatively soft material, but in the case of a hard material, chipping easily occurs.
In addition, sharpness deteriorates sharply due to chip wear. For this reason, a cutter using a sintered diamond tip (hereinafter, referred to as a PCD tip) is also used, but there is a possibility that the cutting edge is chipped. And the life of the cutting edge is shortened.

[0004] Further, since PCD chips have poor workability and increase costs, many of the chips are not PCD chips, but some are PCD chips and the rest are carbide chips. In order to relatively easily process a PCD chip, for example, an electric discharge machine may be used. However, this method cannot sharpen the cutting edge, resulting in a problem that a cut edge of a work material becomes rough. is there.

Further, at the site where building materials are cut, the material to be cut is not limited, and various materials are often cut by the same cutter. In addition to wood, tin and tin may be cut. In the case of a PCD chip, there is a problem that the cutting edge is chipped when these materials are cut.

As a solution to these problems, there is an electrodeposition grindstone in which superabrasive grains are further fixed by electroplating, such as that described in Japanese Utility Model Publication No. 1-111414.
This is effective for grinding steel materials, etc.
When used for cutting building materials with a large amount of swarf, because the amount of protrusion of abrasive grains is small and the gap between abrasive grains is narrow due to the electrodeposition layer,
The cutting was severely clogged and the cutting speed was slow, making practical cutting work difficult.

There is also a brazing grindstone in which superabrasive grains are further bonded with a brazing material in place of electrodeposition to enhance the protruding amount and the bonding force of the abrasive grains, such as those described in Japanese Patent Publication No. 55-22194. There is. As a result of cutting the siding board with this grindstone, clogging was reduced as compared with the electrodeposited grindstone, but the cutting speed was not increased due to the narrow gap between the abrasive grains, and it was hardly sufficient for practical use.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first feature of the present invention is that a cutting cutter in which a plurality of chips are provided on an outer peripheral edge of a rotating substrate. In the above, the chip is made of diamond particles, a hard phase mainly composed of WC, and an iron-based metal.

[0009] Further, as a feature which is an alternative to the above, in a cutting cutter in which a plurality of chips are provided on the outer peripheral edge of a rotating substrate, some of the chips include diamond particles, a hard phase mainly composed of WC, and The remaining chip is made of a sintered body containing a binder phase metal made of an iron-based metal, and the remaining chips are made of a sintered body containing a binder phase metal made of an iron-based metal and a hard phase mainly composed of WC.

As a second feature, the content ratio of the diamond particles is 10 to 50% by volume.

As a third feature, in the sintered body, the ratio of the iron-based metal is higher in a region closer to the joint with the rotating substrate, and the ratio of the WC increases as the distance from the joint increases. is there.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In a cutting cutter according to the present invention, a plurality of chips are provided on an outer peripheral edge of a metal rotary substrate.
In this chip, a hard phase mainly composed of WC is bonded by a bonding phase such as Co, and diamond particles are dispersed therein. That is, it is made of a sintered body in which diamond particles are dispersed in a matrix of a cemented carbide.

By using a cemented carbide in which diamond particles are dispersed for a chip, when cutting a hard material or the like,
Since chipping is reduced and chip wear is reduced as compared with PCD chips, good sharpness is maintained for a long time.

Further, the cemented carbide chip in which diamond particles are dispersed is finished by grinding, and a sharp blade can be formed like the cemented carbide chip. Therefore, the accuracy of the cut edge of the cut material is improved, and the surface roughness of the cut surface is also reduced.

Compared with PCD chips, the toughness is further improved, so that chips are less likely to be chipped, the rake angle can be increased, and the sharpness can be improved. In addition, costs can be reduced.

The content ratio of the diamond particles is set to 10% or more by volume in order to improve the wear resistance, and 50% or less in order to secure the toughness.

[0017] The components of the cemented carbide need not be uniform over the whole, but the dispersion amount of diamond particles, WC and Co
The ratio of the components can be appropriately varied depending on the location.
At the junction between the rotating substrate and the chip, the chip strength can be improved by increasing the proportion of Co in the chip component. Conversely, on the tip side, which is the cutting edge, it is effective to increase the ratio of WC to improve wear resistance.

[0018]

1 shows a cutting cutter according to the present invention. 1 is a chip, 2 is a substrate, and 3 is a slit. The rotating substrate 2 has a diameter of 100 mm, a thickness of 1.2 mm, and is made of tool steel.

The tip 1 contains 20% by volume of diamond particles in a cemented carbide sintered body. The cemented carbide part is a sintered body composed of 90% by weight of WC and 10% by weight of Co. After the rake face of the chip 1 was lapped, the flank face was machined by grinding.

For comparison, a chip made of cemented carbide and a chip made of PCD were also manufactured. These rake faces are lapped in the same manner as the inserts of the present invention, and then the cemented carbide tips are processed by grinding the flank by grinding, and the PCD tips are flared by the electrical discharge machining. went.

When the surface roughness Rz of the flank of the chip manufactured as described above was measured, the chip of the cemented carbide containing diamond particles of the present invention was 0.6 μm, while the chip of the comparative example was 0.6 μm. 0.5 μm for hard alloy chips, PCD
It was 4 μm for the chip. Since the surface roughness of the flank directly affects the accuracy of the cutting edge, the cutting edge of the present invention can obtain a cutting edge almost equivalent to that of a conventional cemented carbide, and has a sharper cutting edge which is sharper than a PCD chip. We were able to.

These chips are mounted on a substrate 2 having the shape shown in FIG.
Was brazed to the outer periphery, a cutting cutter was manufactured, and the siding board was cut. Fifteen chips 1 of the cutting cutter were provided, and all the chips of the cutter of the present invention were cemented carbide chips containing diamond particles. As the cutting cutter of the comparative example, one in which all the tips were provided with cemented carbide tips and the other in which three PCD tips were brazed at equal intervals and the remaining portion was provided with cemented carbide tips were used. Types were made and cut.

As a result, with the cutter of the present invention, a chip was not chipped and a clean cut surface was obtained.
The cutter in which all the chips were made of cemented carbide had higher wear than the cutter of the present invention. As for cutters containing PCD tips, although all the tips had less wear than cemented carbide cutters,
A chip was found in a part of the D chip, and many cut marks were found on the cut surface.

[0024]

As described above, the cutter of the present invention can machine the tip by grinding and is less likely to chip than the PCD tip when machining the cutting edge, so that the cutting edge can be machined with high precision and the conventional carbide tip can be machined. An equivalent sharp edge can be obtained. As a result, when cut with a cutter using the chip of the present invention, the cut surface becomes clean. In addition, wear is less than that of cemented carbide tips, and the life of the cutting cutter is improved. Further, since the toughness is higher than that of the PCD chip and the chip is less likely to be chipped, chipping at the time of cutting is reduced, and the life of the chip is improved and the cut surface is made clean.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cutting cutter of the present invention.

[Explanation of symbols]

 1 chip 2 substrate 3 slit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mineo Onishi 2-80, Hokita-cho, Sakai-shi, Osaka Inside Osaka Diamond Industry Co., Ltd.

Claims (4)

[Claims] 1. A cutting cutter in which a plurality of chips are provided on an outer peripheral edge of a rotary substrate, wherein the chips include diamond particles, a hard phase mainly composed of WC, and a binder phase metal composed of an iron-based metal. A cutting cutter characterized by being formed of a unity. 2. A cutting cutter in which a plurality of chips are provided on an outer peripheral edge of a rotating substrate, wherein a part of the chips includes diamond particles and WC.
And a sintered body including a hard phase mainly composed of WC and a binder phase metal composed of an iron-based metal, and the remaining chips are a sintered body containing a hard phase mainly composed of WC and a binder phase metal composed of an iron-based metal. A cutting cutter comprising: 3. The cutting cutter according to claim 1, wherein the content of the diamond particles is 10 to 50% by volume. 4. The sintered body according to claim 1, wherein the ratio of the iron-based metal is higher in a region closer to the joint with the rotating substrate, and the ratio of the WC is higher as the sintered body is farther from the joint. Item 6. The cutting cutter according to item 1, 2 or 3.